Evaluation of drought features in the Dakbla watershed, Central Highlands of Vietnam

IF 0.6 Q4 WATER RESOURCES Hydrological Research Letters Pub Date : 2021-01-01 DOI:10.3178/hrl.15.77

Vo Ngoc Quynh Tram, H. Somura, T. Moroizumi

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Abstract

: The drought impacts in the Dakbla watershed were assessed based on a combination of hydrological modeling and drought indices. Three drought indices, the Standard‐ ized Precipitation Index ( SPI ), Standardized Soil Moisture Index ( SSI ), and Streamflow Drought Index ( SDI ) were uti‐ lized to evaluate the drought features of meteo-hydrology and agriculture. The results indicated that these indices are well adapted to the local conditions, especially the 12-month time scale. Evaluations of drought features on the watershed scale could provide more specific information regarding drought risk than regional-scale/district-level assessments, because a watershed is a hydrologically fun‐ damental unit to consider water resources management. Additionally, evaluations of drought impacts using the SSI showed longer and higher trends than those using the SPI and SDI in terms of drought duration and frequency. Con‐ sidering the spatial distribution of drought frequency, the areas predominated by agricultural land in the target water‐ shed had higher drought risk. Thus, assessment of agricul‐ tural droughts along with meteo-hydrological droughts is extremely important to support realistic local drought man‐ agement strategies by considering water availability, water balance, and soil characteristics, especially in specific agri‐ cultural areas.

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越南中部高原达克布拉流域干旱特征评价

:采用水文模拟与干旱指数相结合的方法，对达喀尔流域的干旱影响进行了评价。采用标准化降水指数(SPI)、标准化土壤水分指数(SSI)和河流干旱指数(SDI) 3个干旱指数评价了气象水文和农业干旱特征。结果表明，这些指标较好地适应了当地的条件，特别是在12个月的时间尺度上。由于流域是考虑水资源管理的水文基础单位，因此在流域尺度上对干旱特征的评估可以提供比区域尺度/地区级别评估更具体的干旱风险信息。此外，在干旱持续时间和频率方面，使用SSI的干旱影响评估比使用SPI和SDI的干旱影响评估显示出更长和更高的趋势。从干旱频率的空间分布来看，目标流域以农用地为主的区域干旱风险较高。因此，对农业干旱以及气象水文干旱进行评估对于支持现实的当地干旱管理战略至关重要，因为要考虑到水的可用性、水平衡和土壤特征，特别是在特定的农业文化区。

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来源期刊

Hydrological Research Letters WATER RESOURCES-

CiteScore

1.90

自引率

18.20%

发文量

审稿时长

10 weeks

期刊介绍： Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.